Php doc changes (#232)

* Change type indent width for phpdoc param tags

phpcs expects one space between @param tag and type
identifier. Checking
http://manual.phpdoc.org/HTMLSmartyConverter/PHP/phpDocumentor/tutorial_tags.pkg.html
there is only meant to be one space included.

* Remove * at end of phpdoc return tag

The return tag should be the last tag in the phpdoc block and should
not add a extra line for a extra tag.

snippets/php-mode/param-doc

@@ -4,5 +4,5 @@
 # key: *param
 # group: annotation
 # --
-* @param  ${1:type} ${2:$variable} ${3:description}${0:
+* @param ${1:type} ${2:$variable} ${3:description}${0:
 *}

snippets/php-mode/return-doc

@@ -4,5 +4,4 @@
 # key: *return
 # group: annotation
 # --
-* @return ${1:type} ${2:description}${0:
-*}
+* @return ${1:type} ${2:description}